77888988 has 72 divisors (see below), whose sum is σ = 206309376. Its totient is φ = 24746400.

The previous prime is 77888977. The next prime is 77888989. The reversal of 77888988 is 88988877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77888989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78745 + ... + 79727.

It is an arithmetic number, because the mean of its divisors is an integer number (2865408).

Almost surely, 2^77888988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77888988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103154688).

77888988 is an abundant number, since it is smaller than the sum of its proper divisors (128420388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77888988 is a wasteful number, since it uses less digits than its factorization.

77888988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1090 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 63.

The square root of 77888988 is about 8825.4738116432. The cubic root of 77888988 is about 427.0630726210.

The spelling of 77888988 in words is "seventy-seven million, eight hundred eighty-eight thousand, nine hundred eighty-eight".